如何在C＃中将var传递给函数

Question

How I can pass var to function?

I need to create the following unknown data model, and pass it to my function, which shout parse it using RazorRenderer:

var emailData = new {name="value" , name2="value2" ... , nameN="valueN"}

The function can't receive var, so we used object, but then we can't convert it back, and we get an exception when call:

string htmlBody = render.Parse(File.ReadAllText(TemplatePath), emailData );

When I do the following, in same function it works:

var emailData = new { UserRequest = "hello", UserEmail = "name@domain.com" };
string htmlBody = render.Parse(File.ReadAllText(TemplatePath), emailData);

But when try to pass the emailData to the function it not work, any idea?

I can do the rendering out of the function and pass the result to the function, but I thought it may be nice to do it internally inside the function.

BTW- I tried JSON Serialize and Decerialize, with no luck.

Answer 1

If I understand your question correctly, it is not possible. Anonymous type names cannot be represented in user code hence there is no way to make them an input parameter to a function.

Your best bet is to create a type and use that as the return from the query and then pass it into the function. For example,

class YourDataClass {
  public string ColumnName; 
}

var query = (from name in some.Table
            select new YourDataClass { ColumnName = name });
YourMethod(query);

...

YourMethod(IEnumerable<YourData> enumerable);

In this case though, you are only selecting a single field, so it may be easier to just select the field directly. This will cause the query to be typed as an IEnumerable of the field type.